A similar problem is present in the model BV6000s.
viewtopic.php?f=151&t=148071. When you connect the cable to the phone, the actual charge current will be approximately 300-350 mAh (total charge current 500 = 300-350 + 150-200 mAh) and charging time 8-10 hours. In order to raise the total charge current to 1000 mAh, it is necessary to quickly re-connect the cable, while the actual charge current will be 700-750 mAh and the charging time will be approximately 5-6 hours.
The simplest solution is to add a menu item (when connecting a network charger) that would force the charge controller to accept a current of up to 2400 mAh (2.4A) If the installed board allows. With a warning that you can not actively charge and use a smartphone (play games and watch videos), and also that the smartphone when charging it is desirable to lay down on the table with the back side up. Because there can be unpleasant consequences ....